--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/fontservices/textbase/sgdi/FontArabic.cpp Mon Jul 12 14:38:26 2010 +0800
@@ -0,0 +1,450 @@
+// Copyright (c) 2003-2010 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+//
+
+/**
+ @file
+ @internalComponent
+*/
+
+
+//#include <textbase.h>
+#include <gdi.h>
+#include "FontArabic.h"
+#include "TextBasePanic.h"
+
+
+//
+// Arabic Presentation Forms.
+//
+
+
+/**
+ The contextual forms of each character in the range 0621 - 064A, in
+ the order final, initial, medial; followed by the forms of
+ the lam-alef ligatures (lam with 0622, 0623, 0625 and 0627);
+ followed by the forms of the characters in the range 0671 - 06D3
+*/
+LOCAL_D const TUint16 TheArabicShapeTable[] =
+ {
+ // Contextual forms for standard Arabic letters
+ 0x621, 0x621, 0x621, // 621
+ 0xfe82, 0x622, 0x622, // 622
+ 0xfe84, 0x623, 0x623, // 623
+ 0xfe86, 0x624, 0x624, // 624
+ 0xfe88, 0x625, 0x625, // 625
+ 0xfe8a, 0xfe8b, 0xfe8c, // 626
+ 0xfe8e, 0x627, 0x627, // 627
+ 0xfe90, 0xfe91, 0xfe92, // 628
+ 0xfe94, 0x629, 0x629, // 629
+ 0xfe96, 0xfe97, 0xfe98, // 62a
+ 0xfe9a, 0xfe9b, 0xfe9c, // 62b
+ 0xfe9e, 0xfe9f, 0xfea0, // 62c
+ 0xfea2, 0xfea3, 0xfea4, // 62d
+ 0xfea6, 0xfea7, 0xfea8, // 62e
+ 0xfeaa, 0x62f, 0x62f, // 62f
+ 0xfeac, 0x630, 0x630, // 630
+ 0xfeae, 0x631, 0x631, // 631
+ 0xfeb0, 0x632, 0x632, // 632
+ 0xfeb2, 0xfeb3, 0xfeb4, // 633
+ 0xfeb6, 0xfeb7, 0xfeb8, // 634
+ 0xfeba, 0xfebb, 0xfebc, // 635
+ 0xfebe, 0xfebf, 0xfec0, // 636
+ 0xfec2, 0xfec3, 0xfec4, // 637
+ 0xfec6, 0xfec7, 0xfec8, // 638
+ 0xfeca, 0xfecb, 0xfecc, // 639
+ 0xfece, 0xfecf, 0xfed0, // 63a
+ 0x63b, 0x63b, 0x63b, // placeholder
+ 0x63c, 0x63c, 0x63c, // placeholder
+ 0x63d, 0x63d, 0x63d, // placeholder
+ 0x63e, 0x63e, 0x63e, // placeholder
+ 0x63f, 0x63f, 0x63f, // placeholder
+ 0x640, 0x640, 0x640, // 640
+ 0xfed2, 0xfed3, 0xfed4, // 641
+ 0xfed6, 0xfed7, 0xfed8, // 642
+ 0xfeda, 0xfedb, 0xfedc, // 643
+ 0xfede, 0xfedf, 0xfee0, // 644
+ 0xfee2, 0xfee3, 0xfee4, // 645
+ 0xfee6, 0xfee7, 0xfee8, // 646
+ 0xfeea, 0xfeeb, 0xfeec, // 647
+ 0xfeee, 0x648, 0x648, // 648
+ 0xfef0, 0xfbe8, 0xfbe9, // 649
+ 0xfef2, 0xfef3, 0xfef4, // 64A
+
+ // Contextual forms for lam-alef ligatures
+ 0xfef6, 0xfef5, 0xfef5, // 644 + 622
+ 0xfef8, 0xfef7, 0xfef7, // 644 + 623
+ 0xfefa, 0xfef9, 0xfef9, // 644 + 625
+ 0xfefc, 0xfefb, 0xfefb, // 644 + 627
+
+ // Contextual forms for extended Arabic letters for Persian, Urdu, Sindhi, etc.
+ 0xfb51, 0x0671, 0x0671, // 671
+ 0x0672, 0x0672, 0x0672, // placeholder
+ 0x0673, 0x0673, 0x0673, // placeholder
+ 0x0674, 0x0674, 0x0674, // placeholder
+ 0x0675, 0x0675, 0x0675, // placeholder
+ 0x0676, 0x0676, 0x0676, // placeholder
+ 0x0677, 0x0677, 0x0677, // placeholder
+ 0x0678, 0x0678, 0x0678, // placeholder
+ 0xfb67, 0xfb68, 0xfb69, // 679
+ 0xfb5f, 0xfb60, 0xfb61, // 67a
+ 0xfb53, 0xfb54, 0xfb55, // 67b
+ 0x067c, 0x067c, 0x067c, // placeholder
+ 0x067d, 0x067d, 0x067d, // placeholder
+ 0xfb57, 0xfb58, 0xfb59, // 67e
+ 0xfb63, 0xfb64, 0xfb65, // 67f
+
+ 0xfb5b, 0xfb5c, 0xfb5d, // 680
+ 0x0681, 0x0681, 0x0681, // placeholder
+ 0x0682, 0x0682, 0x0682, // placeholder
+ 0xfb77, 0xfb78, 0xfb79, // 683
+ 0xfb73, 0xfb74, 0xfb75, // 684
+ 0x0685, 0x0685, 0x0685, // placeholder
+ 0xfb7b, 0xfb7c, 0xfb7d, // 686
+ 0xfb7f, 0xfb80, 0xfb81, // 687
+ 0xfb89, 0x0688, 0x0688, // 688
+ 0x0689, 0x0689, 0x0689, // placeholder
+ 0x068a, 0x068a, 0x068a, // placeholder
+ 0x068b, 0x068b, 0x068b, // placeholder
+ 0xfb85, 0x068c, 0x068c, // 68c
+ 0xfb83, 0x068d, 0x068d, // 68d
+ 0xfb87, 0x068e, 0x068e, // 68e
+ 0x068f, 0x068f, 0x068f, // placeholder
+
+ 0x0690, 0x0690, 0x0690, // placeholder
+ 0xfb8d, 0x0691, 0x0691, // 691
+ 0x0692, 0x0692, 0x0692, // placeholder
+ 0x0693, 0x0693, 0x0693, // placeholder
+ 0x0694, 0x0694, 0x0694, // placeholder
+ 0x0695, 0x0695, 0x0695, // placeholder
+ 0x0696, 0x0696, 0x0696, // placeholder
+ 0x0697, 0x0697, 0x0697, // placeholder
+ 0xfb8b, 0x0698, 0x0698, // 698
+ 0x0699, 0x0699, 0x0699, // placeholder
+ 0x069a, 0x069a, 0x069a, // placeholder
+ 0x069b, 0x069b, 0x069b, // placeholder
+ 0x069c, 0x069c, 0x069c, // placeholder
+ 0x069d, 0x069d, 0x069d, // placeholder
+ 0x069e, 0x069e, 0x069e, // placeholder
+ 0x069f, 0x069f, 0x069f, // placeholder
+
+ 0x06a0, 0x06a0, 0x06a0, // placeholder
+ 0x06a1, 0x06a1, 0x06a1, // placeholder
+ 0x06a2, 0x06a2, 0x06a2, // placeholder
+ 0x06a3, 0x06a3, 0x06a3, // placeholder
+ 0xfb6b, 0xfb6c, 0xfb6d, // 6a4
+ 0x06a5, 0x06a5, 0x06a5, // placeholder
+ 0xfb6f, 0xfb70, 0xfb71, // 6a6
+ 0x06a7, 0x06a7, 0x06a7, // placeholder
+ 0x06a8, 0x06a8, 0x06a8, // placeholder
+ 0xfb8f, 0xfb90, 0xfb91, // 6a9
+ 0x06aa, 0x06aa, 0x06aa, // 6aa
+ 0x06ab, 0x06ab, 0x06ab, // 6ab
+ 0x06ac, 0x06ac, 0x06ac, // 6ac
+ 0xfbd4, 0xfbd5, 0xfbd6, // 6ad
+ 0x06ae, 0x06ae, 0x06ae, // 6ae
+ 0xfb93, 0xfb94, 0xfb95, // 6af
+
+ 0x06b0, 0x06b0, 0x06b0, // placeholder
+ 0xfb9b, 0xfb9c, 0xfb9d, // 6b1
+ 0x06b2, 0x06b2, 0x06b2, // 6b2
+ 0xfb97, 0xfb98, 0xfb99, // 6b3
+ 0x06b4, 0x06b4, 0x06b4, // placeholder
+ 0x06b5, 0x06b5, 0x06b5, // placeholder
+ 0x06b6, 0x06b6, 0x06b6, // placeholder
+ 0x06b7, 0x06b7, 0x06b7, // placeholder
+ 0x06b8, 0x06b8, 0x06b8, // placeholder
+ 0x06b9, 0x06b9, 0x06b9, // placeholder
+ 0xfb9f, 0x06ba, 0x06ba, // 6ba
+ 0xfba1, 0xfba2, 0xfba3, // 6bb
+ 0x06bc, 0x06bc, 0x06bc, // placeholder
+ 0x06bd, 0x06bd, 0x06bd, // placeholder
+ 0xfbab, 0xfbac, 0xfbad, // 6be
+ 0x06bf, 0x06bf, 0x06bf, // placeholder
+
+ 0xfba5, 0x06c0, 0x06c0, // 6c0
+ 0xfba7, 0xfba8, 0xfba9, // 6c1
+ 0x06c2, 0x06c2, 0x06c2, // placeholder
+ 0x06c3, 0x06c3, 0x06c3, // placeholder
+ 0x06c4, 0x06c4, 0x06c4, // placeholder
+ 0xfbe1, 0x06c5, 0x06c5, // 6c5
+ 0xfbda, 0x06c6, 0x06c6, // 6c6
+ 0xfbd8, 0x06c7, 0x06c7, // 6c7
+ 0xfbdc, 0x06c8, 0x06c8, // 6c8
+ 0xfbe3, 0x06c9, 0x06c9, // 6c9
+ 0x06ca, 0x06ca, 0x06ca, // placeholder
+ 0xfbdf, 0x06cb, 0x06cb, // 6cb
+ 0xfbfd, 0xfbfe, 0xfbff, // 6cc
+ 0x06cd, 0x06cd, 0x06cd, // placeholder
+ 0x06ce, 0x06ce, 0x06ce, // placeholder
+ 0x06cf, 0x06cf, 0x06cf, // placeholder
+
+ 0xfbe5, 0xfbe6, 0xfbe7, // 6d0
+ 0x06d1, 0x06d1, 0x06d1, // placeholder
+ 0xfbaf, 0x06d2, 0x06d2, // 6d2
+ 0xfbb1, 0x06d3, 0x06d3 // 6d3
+ };
+
+
+static const int KFinal = 0;
+static const int KInitial = 1;
+static const int KMedial = 2;
+static const int KStandardShapeTableOffset = 0x621;
+static const int KLamAlefShapeTableStart = 0x64B - 0x621;
+static const int KExtendedShapeTableOffset = 0x671 - (0x64f - 0x621);
+
+
+static inline TInt ArabicShapeTableIndex(TInt aCode)
+ {
+ if (aCode >= 0x621 && aCode <= 0x64a)
+ return (aCode - KStandardShapeTableOffset) * 3;
+ if (aCode >= 0x671 && aCode <= 0x6d3)
+ return (aCode - KExtendedShapeTableOffset) * 3;
+ return KErrNotFound;
+ }
+
+
+static inline TBool IsArabicPoint(TInt aCode)
+ {
+ return (aCode >= 0x64B && aCode <= 0x655) || aCode == 0x670;
+ }
+
+TInt ConsumeCharsAndDeterminePresentationForm(const TUtf32Iterator& aText,
+ TUint aFlags, TInt& aLigaturePortionsRemaining)
+/**
+ Get the Arabic or other presentation form, consuming as many characters
+ as necessary. This function can cope with text that has already been
+ reversed.
+@internalComponent
+*/
+ {
+ TUint c = aText.Get();
+ TInt index = ArabicShapeTableIndex(c);
+ if (index != -1)
+ {
+ if (aLigaturePortionsRemaining != 0)
+ {
+ --aLigaturePortionsRemaining;
+ TEXTBASE_ASSERT_DEBUG(!aText.AtEnd(), ETextBasePanic_Invariant);
+ return 0xFFFF;
+ }
+
+ int position = -1;
+
+ // Find previous and next character, skipping Arabic points.
+ TUtf32Iterator tmpText(aText);
+ tmpText.Prev();
+ TUint prev = 0xFFFF;
+ while (!tmpText.BeforeStart() && (prev == 0xFFFF || IsArabicPoint(prev)))
+ prev = tmpText.GetThenPrev();
+
+ tmpText = aText;
+ tmpText.Next();
+ TUint next = 0xFFFF;
+ while (!tmpText.AtEnd() && (next == 0xFFFF || IsArabicPoint(next)))
+ next = tmpText.GetThenNext();
+
+ TInt possible_lam = (aFlags & CFont::TPositionParam::EFLogicalOrder)?
+ c : next;
+ TInt possible_alef = (aFlags & CFont::TPositionParam::EFLogicalOrder)?
+ next : c;
+
+ // Perform lam-alef ligation if necessary.
+ if (possible_lam == 0x644 &&
+ (possible_alef == 0x622 || possible_alef == 0x623 || possible_alef == 0x625 || possible_alef == 0x627))
+ {
+ switch(possible_alef)
+ {
+ case 0x622:
+ {
+ c = 0xfef5;
+ index = KLamAlefShapeTableStart;
+ break;
+ }
+ case 0x623:
+ {
+ c = 0xfef7;
+ index = KLamAlefShapeTableStart + 1;
+ break;
+ }
+ case 0x625:
+ {
+ c = 0xfef9;
+ index = KLamAlefShapeTableStart + 2;
+ break;
+ }
+ default:
+ {
+ c = 0xfefb;
+ index = KLamAlefShapeTableStart + 3;
+ }
+ }
+ index *= 3;
+ aLigaturePortionsRemaining = 2;
+
+ next = 0xFFFF;
+ while (!tmpText.AtEnd() && (next == 0xFFFF || IsArabicPoint(next)))
+ {
+ next = tmpText.Get();
+ tmpText.Next();
+ }
+ }
+
+ TInt left = (aFlags & CFont::TPositionParam::EFLogicalOrder)? prev : next;
+ TInt right = (aFlags & CFont::TPositionParam::EFLogicalOrder)? next : prev;
+
+ TBool prefix = FALSE;
+ if (left == 0x640 || left == 0x200D) // kashida or Zero-Width Joiner
+ prefix = TRUE;
+ else
+ {
+ TInt left_index = ArabicShapeTableIndex(left);
+ if (left_index != -1)
+ {
+ if (static_cast<TInt>(TheArabicShapeTable[left_index + KInitial]) != left ||
+ static_cast<TInt>(TheArabicShapeTable[left_index + KMedial]) != left)
+ prefix = TRUE;
+ }
+ }
+ TBool suffix = FALSE;
+ if (right == 0x640 || right == 0x200D) // kashida or Zero-Width Joiner
+ suffix = TRUE;
+ else
+ {
+ TInt right_index = ArabicShapeTableIndex(right);
+ if (right_index != -1)
+ {
+ if (static_cast<TInt>(TheArabicShapeTable[right_index + KFinal]) != right ||
+ static_cast<TInt>(TheArabicShapeTable[right_index + KMedial]) != right)
+ suffix = TRUE;
+ }
+ }
+ TBool medial = static_cast<TUint>(TheArabicShapeTable[index + KMedial]) != c;
+ if (medial)
+ {
+ if (prefix && suffix)
+ position = KMedial;
+ else if (prefix)
+ position = KFinal;
+ else if (suffix)
+ position = KInitial;
+ }
+ else
+ {
+ if (prefix)
+ position = KFinal;
+ else if (suffix)
+ position = KInitial;
+ }
+ if (position >= 0)
+ c = TheArabicShapeTable[index + position];
+ }
+
+ return c;
+ }
+
+
+//
+//
+// GlyphSelector_Arabic Class definition
+//
+//
+
+TBool GlyphSelector_Arabic::Process(TGlyphSelectionState& aGss, RShapeInfo&)
+ {
+ // Select glyph - use presentation form if applicable.
+ TInt ligaturePortions = aGss.iLigaturePortionsRemaining;
+ TUint flags = aGss.iParam.iFlags;
+ TUint code = ConsumeCharsAndDeterminePresentationForm(aGss.iText,
+ flags, ligaturePortions);
+
+ aGss.iText.Next();
+ aGss.iClusterState = !aGss.iText.AtEnd() &&
+ (aGss.iText.Get().GetCategory() & 0xF0) == TChar::EMarkGroup?
+ TGlyphSelectionState::EGClusterNotComplete
+ : TGlyphSelectionState::EGClusterComplete;
+
+ // If we are beginning a new portion of a ligature, we must set the state.
+ if (ligaturePortions != aGss.iLigaturePortionsRemaining)
+ {
+ if (ligaturePortions != 1)
+ aGss.iClusterState = TGlyphSelectionState::EGClusterNotComplete;
+ aGss.iLigaturePortionFirstMark = aGss.iParam.iOutputGlyphs;
+ if (ligaturePortions < aGss.iLigaturePortionsRemaining)
+ {
+ aGss.iLigaturePortionsRemaining = ligaturePortions;
+ // We have just swallowed a non-initial part of the ligature, which
+ // must not be drawn.
+ TEXTBASE_ASSERT_DEBUG(code == 0xFFFF, ETextBasePanic_Invariant);
+ return ETrue;
+ }
+ aGss.iLigaturePortionsRemaining = ligaturePortions;
+ }
+
+ // In this method we always output the glyph code calculate previously.
+ if (!aGss.AppendGlyphToCluster(code))
+ return EFalse;
+
+ if (!aGss.IsCombiningClass())
+ {
+ aGss.iPen = TGlyphSelectionState::EPenAdvance_Yes;
+ return ETrue;
+ }
+
+ // Adjust glyph's bounds further to position this character.
+ aGss.iPen = TGlyphSelectionState::EPenAdvance_No;
+ TRect baseBounds = aGss.iParam.iOutput[0].iBounds;
+ TInt firstMark = 1;
+ if (aGss.iLigaturePortionsRemaining != 0)
+ {
+ TInt centre = (baseBounds.iBr.iX + baseBounds.iTl.iX) >> 1;
+ TBool firstHalf = aGss.iLigaturePortionsRemaining == 2;
+ TBool rightHandSide = flags & CFont::TPositionParam::EFLogicalOrder?
+ firstHalf : !firstHalf;
+ if (rightHandSide)
+ baseBounds.iTl.iX = centre;
+ else
+ baseBounds.iBr.iX = centre;
+ if (firstHalf)
+ aGss.iClusterState = TGlyphSelectionState::EGClusterNotComplete;
+ firstMark = aGss.iLigaturePortionFirstMark;
+ }
+ aGss.CombineLastGlyphToBase(baseBounds, firstMark);
+
+ return ETrue;
+ }
+
+
+TBool GlyphSelector_Arabic::CharactersJoin(TInt aLeftCharacter, TInt aRightCharacter)
+ {
+ // All the characters join to the right, so we don't need to look them up.
+ // as long as they are there at all, it is OK.
+ TBool leftIsFixedJoiner = aLeftCharacter == 0x640 || aLeftCharacter == 0x200D;
+ if (!leftIsFixedJoiner)
+ {
+ TInt leftIndex = ArabicShapeTableIndex(aLeftCharacter);
+ if (leftIndex == -1)
+ return EFalse;
+ if (static_cast<TInt>(TheArabicShapeTable[leftIndex + KFinal])
+ == aLeftCharacter)
+ return EFalse;
+ }
+ if (aRightCharacter == 0x640 || aRightCharacter == 0x200D)
+ return !leftIsFixedJoiner;
+ TInt rightIndex = ArabicShapeTableIndex(aRightCharacter);
+ return rightIndex != -1
+ && static_cast<TInt>(TheArabicShapeTable[rightIndex + KInitial])
+ != aRightCharacter;
+ }
+